请问各位大侠：怎么将checkbox加载到Jtree中？

这里有个例子，参考一下吧
import javax.swing.*;
import javax.swing.event.TreeExpansionEvent;
import javax.swing.event.TreeExpansionListener;
import javax.swing.tree.*;
import java.awt.*;
import java.awt.event.*;
import java.io.File;
import java.util.Vector;public class FileTree3
extends JFrame
{
public static final ImageIcon ICON_COMPUTER =
new ImageIcon("computer.gif");
public static final ImageIcon ICON_DISK =
new ImageIcon("disk.gif");
public static final ImageIcon ICON_FOLDER =
new ImageIcon("folder.gif");
public static final ImageIcon ICON_EXPANDEDFOLDER =
new ImageIcon("expandedfolder.gif"); protected JTree  m_tree;
protected DefaultTreeModel m_model;
protected JTextField m_display; protected JPopupMenu m_popup;
protected Action m_action;
protected TreePath m_clickedPath; public FileTree3()
{
super("Directories Tree [Tool Tips]");
setSize(400, 300); DefaultMutableTreeNode top = new DefaultMutableTreeNode(
new IconData(ICON_COMPUTER, null, "Computer")); DefaultMutableTreeNode node;
File[] roots = File.listRoots();
for (int k=0; k<roots.length; k++)
{
node = new DefaultMutableTreeNode(new IconData(ICON_DISK,
null, new FileNode(roots[k])));
top.add(node);
node.add(new DefaultMutableTreeNode( new Boolean(true) ));
} m_model = new DefaultTreeModel(top);
// NEW
m_tree = new JTree(m_model)
{
public String getToolTipText(MouseEvent ev)
{
if(ev == null)
return null;
TreePath path = m_tree.getPathForLocation(ev.getX(),
ev.getY());
if (path != null)
{
FileNode fnode = getFileNode(getTreeNode(path));
if (fnode==null)
return null;
File f = fnode.getFile();
return (f==null ? null : f.getPath());
}
return null;
}
};
ToolTipManager.sharedInstance().registerComponent(m_tree);                m_tree.putClientProperty("JTree.lineStyle", "Angled"); TreeCellRenderer renderer = new
IconCellRenderer();
m_tree.setCellRenderer(renderer);
        m_tree.addTreeExpansionListener(new
DirExpansionListener());
m_tree.getSelectionModel().setSelectionMode(
TreeSelectionModel.SINGLE_TREE_SELECTION);
m_tree.setShowsRootHandles(true);
m_tree.setEditable(false); JScrollPane s = new JScrollPane();
s.getViewport().add(m_tree);
getContentPane().add(s, BorderLayout.CENTER); m_display = new JTextField();
m_display.setEditable(false);
getContentPane().add(m_display, BorderLayout.NORTH); m_popup = new JPopupMenu();
m_action = new AbstractAction()
{
public void actionPerformed(ActionEvent e)
{
if (m_clickedPath==null)
return;
if (m_tree.isExpanded(m_clickedPath))
m_tree.collapsePath(m_clickedPath);
else
m_tree.expandPath(m_clickedPath);
}
};
m_popup.add(m_action);
m_popup.addSeparator(); Action a1 = new AbstractAction("Delete")
{
public void actionPerformed(ActionEvent e)
{
                                m_tree.repaint();
JOptionPane.showMessageDialog(FileTree3.this,
"Delete option is not implemented",
"Info", JOptionPane.INFORMATION_MESSAGE);
}
};
m_popup.add(a1); Action a2 = new AbstractAction("Rename")
{
public void actionPerformed(ActionEvent e)
{
                                m_tree.repaint();
JOptionPane.showMessageDialog(FileTree3.this,
"Rename option is not implemented",
"Info", JOptionPane.INFORMATION_MESSAGE);
}
};
m_popup.add(a2);
m_tree.add(m_popup); WindowListener wndCloser = new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
};
addWindowListener(wndCloser); setVisible(true);
} DefaultMutableTreeNode getTreeNode(TreePath path)
{
return (DefaultMutableTreeNode)(path.getLastPathComponent());
} FileNode getFileNode(DefaultMutableTreeNode node)
{
if (node == null)
return null;
Object obj = node.getUserObject();
if (obj instanceof IconData)
obj = ((IconData)obj).getObject();
if (obj instanceof FileNode)
return (FileNode)obj;
else
return null;
}

class DirExpansionListener implements TreeExpansionListener
    {
        public void treeExpanded(TreeExpansionEvent event)
        {
            final DefaultMutableTreeNode node = getTreeNode(
                event.getPath());
            final FileNode fnode = getFileNode(node);            Thread runner = new Thread()
            {
              public void run()
              {
                if (fnode != null && fnode.expand(node))
                {
                  Runnable runnable = new Runnable()
                  {
                    public void run()
                    {
                       m_model.reload(node);
                    }
                  };
                  SwingUtilities.invokeLater(runnable);
                }
              }
            };
            runner.start();
        }        public void treeCollapsed(TreeExpansionEvent event) {}
    } public static void main(String argv[])
{
new FileTree3();
}
}class IconCellRenderer
extends    JCheckBox
implements TreeCellRenderer
{
protected Color m_textSelectionColor;
protected Color m_textNonSelectionColor;
protected Color m_bkSelectionColor;
protected Color m_bkNonSelectionColor;
protected Color m_borderSelectionColor; protected boolean m_selected; public IconCellRenderer()
{
super();
m_textSelectionColor = UIManager.getColor(
"Tree.selectionForeground");
m_textNonSelectionColor = UIManager.getColor(
"Tree.textForeground");
m_bkSelectionColor = UIManager.getColor(
"Tree.selectionBackground");
m_bkNonSelectionColor = UIManager.getColor(
"Tree.textBackground");
m_borderSelectionColor = UIManager.getColor(
"Tree.selectionBorderColor");
setOpaque(false);
} public Component getTreeCellRendererComponent(JTree tree,
Object value, boolean sel, boolean expanded, boolean leaf,
int row, boolean hasFocus) {
DefaultMutableTreeNode node =
(DefaultMutableTreeNode)value;
Object obj = node.getUserObject();
setText(obj.toString());                if (obj instanceof Boolean)
                  setText("Retrieving data..."); if (obj instanceof IconData)
{
IconData idata = (IconData)obj;
if (expanded)
setSelected(true);
else
setSelected(false);
}
else
setSelected(false); setFont(tree.getFont());
setForeground(sel ? m_textSelectionColor :
m_textNonSelectionColor);
setBackground(sel ? m_bkSelectionColor :
m_bkNonSelectionColor);
m_selected = sel;
return this;
}

public void paintComponent(Graphics g)
{
Color bColor = getBackground();
Icon icon = getIcon(); g.setColor(bColor);
int offset = 0;
if(icon != null && getText() != null)
offset = (icon.getIconWidth() + getIconTextGap());
g.fillRect(offset, 0, getWidth() - 1 - offset,
getHeight() - 1); setSelected(m_selected); super.paintComponent(g);
    }
}class IconData
{
protected Icon   m_icon;
protected Icon   m_expandedIcon;
protected Object m_data; public IconData(Icon icon, Object data)
{
m_icon = icon;
m_expandedIcon = null;
m_data = data;
} public IconData(Icon icon, Icon expandedIcon, Object data)
{
m_icon = icon;
m_expandedIcon = expandedIcon;
m_data = data;
} public Icon getIcon()
{
return m_icon;
} public Icon getExpandedIcon()
{
return m_expandedIcon!=null ? m_expandedIcon : m_icon;
} public Object getObject()
{
return m_data;
} public String toString()
{
return m_data.toString();
}
}class FileNode
{
protected File m_file; public FileNode(File file)
{
m_file = file;
} public File getFile()
{
return m_file;
} public String toString()
{
return m_file.getName().length() > 0 ? m_file.getName() :
m_file.getPath();
} public boolean expand(DefaultMutableTreeNode parent)
{
DefaultMutableTreeNode flag =
(DefaultMutableTreeNode)parent.getFirstChild();
if (flag==null)   // No flag
return false;
Object obj = flag.getUserObject();
if (!(obj instanceof Boolean))
return false;      // Already expanded parent.removeAllChildren();  // Remove Flag File[] files = listFiles();
if (files == null)
return true; Vector v = new Vector(); for (int k=0; k<files.length; k++)
{
File f = files[k];
if (!(f.isDirectory()))
continue; FileNode newNode = new FileNode(f); boolean isAdded = false;
for (int i=0; i<v.size(); i++)
{
FileNode nd = (FileNode)v.elementAt(i);
if (newNode.compareTo(nd) < 0)
{
v.insertElementAt(newNode, i);
isAdded = true;
break;
}
}
if (!isAdded)
v.addElement(newNode);
} for (int i=0; i<v.size(); i++)
{
FileNode nd = (FileNode)v.elementAt(i);
IconData idata = new IconData(FileTree3.ICON_FOLDER,
FileTree3.ICON_EXPANDEDFOLDER, nd);
DefaultMutableTreeNode node = new
DefaultMutableTreeNode(idata);
parent.add(node); if (nd.hasSubDirs())
node.add(new DefaultMutableTreeNode(
new Boolean(true) ));
} return true;
} public boolean hasSubDirs()
{
File[] files = listFiles();
if (files == null)
return false;
for (int k=0; k<files.length; k++)
{
if (files[k].isDirectory())
return true;
}
return false;
} public int compareTo(FileNode toCompare)
{
return  m_file.getName().compareToIgnoreCase(
toCompare.m_file.getName() );
} protected File[] listFiles()
{
if (!m_file.isDirectory())
return null;
try
{
return m_file.listFiles();
}
catch (Exception ex)
{
JOptionPane.showMessageDialog(null,
"Error reading directory "+m_file.getAbsolutePath(),
"Warning", JOptionPane.WARNING_MESSAGE);
return null;
}
}
}

checkbox的主要是通过IconCellRenderer这个类
来实现的，这个还有读系统目录的功能。

谢谢楼上的好心人，您的代码我大概浏览了一下，哇，好难啊。看来我要实现的功能对我这个初学者来还真是一个挑战啊。小弟会好好的分析您给的代码。
其他的高手还有什么见解吗，请继续指导啊。（最好用简单一点的代码先实现最基本的checkbox+Jtree，让小弟先有一个大体的思路，然后再逐步完善）
再次谢谢“键之舞者”！

另外，请问“键之舞者“怎么才能实现可以对checkbox进行多选啊？（现在您给我设计的只能进行单选）

csdn上面果然有高手啊。
以前就听说过这个论坛，但是一直没有注册。现在刚注册就发现真是个好地方。
可以长见识，学知识啊。
楼主的这个问题已经困扰我很长时间了。
“键之舞者”真厉害，您的代码我运行过，的确不错。
但是有许多地方我读不懂，所以没法提炼出我要实现的功能。
如果身边有您这样的高手就好了，我就可以少走许多弯路了。
键之舞者，您能对您的代码的大体实现过程或者思想做一个简单的介绍吗。
小妹我认真的看了两遍了还是不太清楚。
在这还是谢谢您了，还有楼主。

呵呵，大家实在太客气了。
DefaultTreeSelectionModel selectionModel = new DefaultTreeSelectionModel();
selectionModel.setSelectionMode(TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION);
m_tree.setSelectionModel(selectionModel);
在构造方法里面，加入上面三条语句就能够实现，多选了，不过要按住shift健，才行。

一个比较基本的例子import javax.swing.*;
import javax.swing.tree.TreeCellRenderer;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeSelectionModel;
import javax.swing.tree.TreeSelectionModel;
import java.awt.*;
public class TestTree extends JFrame {
  private JTree m_tree;
  public TestTree(){
    m_tree = new JTree(new String[]{"A","B","C","D","E"});
    m_tree.setCellRenderer(new IconCellRenderer());
    DefaultTreeSelectionModel selectionModel = new DefaultTreeSelectionModel();
     selectionModel.setSelectionMode(TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION);
     m_tree.setSelectionModel(selectionModel);    this.getContentPane().add(m_tree);
    this.setSize(300,400);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.show();  }
  public static void main(String[] args){
     new TestTree();
  }
  class IconCellRenderer
    extends    JCheckBox
    implements TreeCellRenderer
{    protected Color m_textSelectionColor;
    protected Color m_textNonSelectionColor;
    protected Color m_bkSelectionColor;
    protected Color m_bkNonSelectionColor;
    protected Color m_borderSelectionColor;    protected boolean m_selected;    public IconCellRenderer()
    {
        super();
        m_textSelectionColor = UIManager.getColor(
            "Tree.selectionForeground");
        m_textNonSelectionColor = UIManager.getColor(
            "Tree.textForeground");
        m_bkSelectionColor = UIManager.getColor(
            "Tree.selectionBackground");
        m_bkNonSelectionColor = UIManager.getColor(
            "Tree.textBackground");
        m_borderSelectionColor = UIManager.getColor(
            "Tree.selectionBorderColor");
        setOpaque(false);
    }    public Component getTreeCellRendererComponent(JTree tree,
                                                  Object value, boolean sel, boolean expanded, boolean leaf,
                                                  int row, boolean hasFocus)    {
        DefaultMutableTreeNode node =
            (DefaultMutableTreeNode)value;
        Object obj = node.getUserObject();
        setText(obj.toString());                if (obj instanceof Boolean)
                  setText("Retrieving data...");        if (obj instanceof IconData)
        {
            IconData idata = (IconData)obj;
            if (expanded)
                setSelected(true);
            else
                setSelected(false);
        }
        else
            setSelected(false);        setFont(tree.getFont());
        setForeground(sel ? m_textSelectionColor :
            m_textNonSelectionColor);
        setBackground(sel ? m_bkSelectionColor :
            m_bkNonSelectionColor);
        m_selected = sel;
        return this;
    }    public void paintComponent(Graphics g)
    {
        Color bColor = getBackground();
        Icon icon = getIcon();        g.setColor(bColor);
        int offset = 0;
        if(icon != null && getText() != null)
            offset = (icon.getIconWidth() + getIconTextGap());
        g.fillRect(offset, 0, getWidth() - 1 - offset,
            getHeight() - 1);        setSelected(m_selected);        super.paintComponent(g);
    }
}
}

上面的代码有点问题
把IconData相关的注释一下

谢谢“键之舞者”！
您上面的代码我运行了，没有什么问题。
但是小弟现在要设计的东西必须用到checkbox的多选功能，如果只通过按住shift来实现多选肯定是不行的。另外小弟还要向树中加上选择后对应的“处理事件”。不知道对应着checkbox的相应的事件应该加到什么地方。还请您费点心再指导一下，谢谢您了！

http://jroller.com/page/santhosh?entry=jtree_with_checkboxes

其实，我对这里也不熟悉
下面这个例子能够多选。import javax.swing.*;
import javax.swing.tree.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.Vector;
public class TestTree extends JFrame {
  private JTree m_tree;
  //The vector used to save the selected TreePaths.
  private Vector m_selectPaths;
  public TestTree(){
    m_tree = new JTree(new String[]{"A","B","C","D","E"});
    m_selectPaths = new Vector();
    m_tree.setCellRenderer(new IconCellRenderer());
    DefaultTreeSelectionModel selectionModel = new DefaultTreeSelectionModel();
     selectionModel.setSelectionMode(TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION);
    m_tree.setSelectionModel(selectionModel);
    m_tree.addMouseListener(new MouseEventListener());
    this.getContentPane().add(m_tree);
    this.setSize(300,400);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.show();  }
  public static void main(String[] args){
     new TestTree();
  }
  class IconCellRenderer
    extends    JCheckBox
    implements TreeCellRenderer
{
    protected DefaultMutableTreeNode treeNode;
    protected boolean m_selected;    public IconCellRenderer()
    {
        super();
        setOpaque(false);
    }    public Component getTreeCellRendererComponent(JTree tree,
                                                  Object value, boolean sel, boolean expanded, boolean leaf,
                                                  int row, boolean hasFocus)
    {
        DefaultMutableTreeNode node =
            (DefaultMutableTreeNode)value;
        this.treeNode = node;
        Object obj = node.getUserObject();
        setText(obj.toString());
        setSelected(sel);
        return this;
    }    public void paintComponent(Graphics g)
    {
        Color bColor = getBackground();
        Icon icon = getIcon();        g.setColor(bColor);
        int offset = 0;
        if(icon != null && getText() != null)
            offset = (icon.getIconWidth() + getIconTextGap());
        g.fillRect(offset, 0, getWidth() - 1 - offset,
            getHeight() - 1);
        super.paintComponent(g);
    }
}
  class MouseEventListener extends MouseAdapter {
    public void mouseClicked(MouseEvent e) {
      if(m_selectPaths.contains(m_tree.getPathForLocation(e.getX(), e.getY()))){
        m_selectPaths.remove(m_tree.getPathForLocation(e.getX(), e.getY()));      } else {
        m_selectPaths.add(m_tree.getPathForLocation(e.getX(), e.getY()));
      }
       m_tree.setSelectionPaths((TreePath[]) m_selectPaths.toArray(new TreePath[0]));
    }
  }
}

再次谢谢"键之舞者"的帮助！
我现在还想问的一个问题就是，如果想把有关jtree的内容进行彻底的了解，可以随意设计出自己想要的jtree，我应该从什么地方开始学习。我借了许多有关jtree的书，但是都讲的比较简单。什么地方有比较好的有关这方面的资料啊，最好是底层一点的。
请各位有相关资料的高手指导一下。谢谢了！

调试易

请问各位大侠：怎么将checkbox加载到Jtree中？

解决方案 »